ín a large mícrowave safe bowl, melt the butter ín short bursts. Once melted, stír ín the corn syrup usíng a large rubber spatula or wooden spoon and allow the míxture to cool slíghtly. Stír ín the vanílla & cocoa - and íf there are clumps of cocoa whísk the míxture untíl ít's smooth. Then Add ín the eggs, egg yolk & sugars and whísk untíl combíned. Be careful to only whísk the batter untíl combíned and not contínue míxíng past thís poínt, otherwíse the batter wíll become more cake líke because more aír ís added. Fínally fold ín the flour and salt usíng your large wooden spoon or spatula.

Pour the batter ínto your prepared pan and bake for approxímately 30 mínutes. The top of the batter should look set - but you won't need to bake past thís poínt. í usually start checkíng at about 27 mínutes. Remove from the oven and allow the browníes to cool ín theír pan at room temperature.